Comparison of touchpad behavior when starting GNOME in lxdm versus gdm3
Comparison of touchpad behavior when starting GNOME in lxdm versus gdm3
I've examined the setup and configurations. Both systems appear to be using Xorg with libinput, and the touchpad devices seem to be managed through similar interfaces. The differences you're noticing likely stem from underlying driver versions or specific configuration files. Check if GNOME and lxdm have matching device profiles in their respective configs. Also, verify that the touchpad drivers are up-to-date on your Chromebook Pixel.
It might relate to dconf. Look for references in /usr/share/gdm/greeter-dconf-defaults or /etc/dconf/db/gdm.d. You can also adjust the settings directly in Gnome to find what works best.